Four days ago, Derek Jeter resumed baseball activity at the Yankees’ complex in Tampa, Fla. after eight days off. He played catch. He did the same the next day. He added long toss as the week went on, and completed strengthening exercises on his nettlesome left ankle. Rain kept him indoors on Thursday. It’s been 20 days since he attempted to play in the field. It’s been 13 days since he attempted to run on the diamond, after four at-bats in a minor-league game on March 23 triggered a recurrence of pain around his ankle. As Jeter attempts to return from surgery, manager Joe Girardi believes Jeter will need an extensive number of rehabilitation games before he can rejoin the Yankees.